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x86/ibt,crypto: Add ENDBR for the jump-table entries 

The code does:

	## branch into array
	mov     jump_table(,%rax,8), %bufp
	JMP_NOSPEC bufp

resulting in needing to mark the jump-table entries with ENDBR.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.110500806@infradead.org
This commit is contained in:
Peter Zijlstra 2022-03-08 16:30:27 +01:00
parent c3b037917c
commit 214b9a83b6
1 changed files with 3 additions and 0 deletions
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3
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
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@ -195,6 +195,7 @@ crc_array:
.altmacro
LABEL crc_ %i
.noaltmacro
ENDBR
crc32q -i*8(block_0), crc_init
crc32q -i*8(block_1), crc1
crc32q -i*8(block_2), crc2
@ -204,6 +205,7 @@ LABEL crc_ %i
.altmacro
LABEL crc_ %i
.noaltmacro
ENDBR
crc32q -i*8(block_0), crc_init
crc32q -i*8(block_1), crc1
# SKIP crc32 -i*8(block_2), crc2 ; Don't do this one yet
@ -237,6 +239,7 @@ LABEL crc_ %i
################################################################
LABEL crc_ 0
ENDBR
mov tmp, len
cmp $128*24, tmp
jae full_block